Install aolserver4-nssha1 by entering the following commands in the terminal:
sudo apt update sudo apt install aolserver4-nssha1
Description:
AOLserver4 module: performs SHA1 hashes Provides a Tcl
infrastructure for generating SHA1 hashes. This mini-library is based on the NIST Secure Hash Algorithm implementation by Peter C. Gutmann
Homepage: http://www.aolserver.com/
Version: 0.1-3build1
Section: universe/web